linux-kernel - Re: Enabling peer to peer device transactions for PCIe devices

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Date:   Sun, 4 Dec 2016 07:06:49 -0600
From:   "Stephen Bates" <sbates@...thlin.com>
To:     "Haggai Eran" <haggaie@...lanox.com>
Cc:     "Logan Gunthorpe" <logang@...tatee.com>,
        "Jason Gunthorpe" <jgunthorpe@...idianresearch.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "Suravee.Suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "John.Bridgman@....com" <john.bridgman@....com>,
        "Alexander.Deucher@....com" <alexander.deucher@....com>,
        "Linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "Max Gurtovoy" <maxg@...lanox.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "serguei.sagalovitch@....com" <serguei.sagalovitch@....com>,
        "Paul.Blinzer@....com" <paul.blinzer@....com>,
        "Felix.Kuehling@....com" <felix.kuehling@....com>,
        "ben.sander@....com" <ben.sander@....com>
Subject: Re: Enabling peer to peer device transactions for PCIe devices

>>
>> The NVMe fabrics stuff could probably make use of this. It's an
>> in-kernel system to allow remote access to an NVMe device over RDMA. So
>> they ought to be able to optimize their transfers by DMAing directly to
>>  the NVMe's CMB -- no userspace interface would be required but there
>> would need some kernel infrastructure.
>
> Yes, that's what I was thinking. The NVMe/f driver needs to map the CMB
> for RDMA. I guess if it used ZONE_DEVICE like in the iopmem patches it
> would be relatively easy to do.
>

Haggai, yes that was one of the use cases we considered when we put
together the patchset.